perl -lpe 'substr $_, 0, 1 = "";'
Can't modify constant item in scalar assignment at -e line 1, near """;"
Execution of -e aborted due to compilation errors.

perl -lpe 'substr $_, 0, 1, "";'
this is
his is

##</code><code>##

perl -lpe 'substr($_, 0, 1) = "" '
test
est